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CS5016-BP32 Datasheet(PDF) 30 Page - Cirrus Logic |
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CS5016-BP32 Datasheet(HTML) 30 Page - Cirrus Logic |
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30 / 46 page  Clock Feedthrough in the CS5014 and CS5016 Maintaining the integrity of analog signals in the presence of digital switching noise is a difficult problem. The CS5014/16 can be synchronized to the digital system using the CLKIN input to avoid conversion errors due to asynchronous in- terference. However, digital interference will still affect sampling purity due to coupling between the CS5014/16’s analog input and master clock. The effect of clock feedthrough depends on the sampling conditions. If the sampling signal at the HOLD input is synchronized to the master clock, clock feedthrough will appear as a dc offset at the CS5014/16’s output. The offset could theoreti- cally reach the peak coupling magnitude (Figure 35), but the probability of this occurring is small since the peaks are spikes of short dura- tion. If sampling is performed asynchronously with the master clock, clock feedthrough will appear as an ac error at the CS5014/16’s output. With a fixed Analog Input Source Impedance 200 25 50 50 50 4MHz 2MHz Master Clock Clock Feedthrough Int/Ext Freq Internal External External External External 2MHz 4MHz 4MHz RMS Peak-to-Peak 15uV 25uV 40uV 25uV 80uV 70uV 110uV 150uV 110uV 325uV Figure 35. Examples of Measured Clock Feedthrough Signal Amplitude Relative to Full Scale dc Input Frequency 0dB -20dB -40dB -60dB -80dB -100dB -120dB 28 kHz Sampling Rate: 56 kHz Full Scale: 9V p-p S/(N+D): 81.5 dB 12 kHz Figure 31. CS5014 FFT plot with 12 kHz Full Scale Input Signal Amplitude Relative to Full Scale dc Input Frequency 0dB -20dB -40dB -60dB -80dB -100dB -120dB 25 kHz Sampling Rate: 50 kHz Full Scale: 9V p-p S/(N+D): 84.3 dB 12 kHz Figure 33. CS5016 FFT plot with 12 kHz Full Scale Input Signal Amplitude Relative to Full Scale dc Input Frequency 0dB -20dB -40dB -60dB -80dB -100dB -120dB 25 kHz Sampling Rate: 50 kHz Full Scale: 9V p-p S/(N+D): 71.9 dB 12 kHz Figure 34. CS5016 FFT plot with 12 kHz -20 dB Input Signal Amplitude Relative to Full Scale dc Input Frequency 0dB -20dB -40dB -60dB -80dB -100dB -120dB 28 kHz Sampling Rate: 56 kHz Full Scale: 9V p-p S/(N+D): 64.6 dB 12 kHz Figure 32. CS5014 FFT plot with 12 kHz -20 dB Input CS5012A, CS5014, CS5016 2-36 DS14F6 |
Similar Part No. - CS5016-BP32 |
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Similar Description - CS5016-BP32 |
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